![]() Having visited the factory, I have seen first-hand the degree of care and attention given not only to the hand-built construction of these drivers but also great pride over the level of quality assurance performed. The SCM40A features ATC's trademark 75mm soft-dome midrange unit that can trace its lineage back to 1976, alongside a 25mm soft dome tweeter with precision alloy wave guide and a 164mm short coil bass driver with a massive central dust cap. This gives total control over every aspect of production, rather than relying on original equipment manufacturers to do the design or production work. Interestingly, the company still uses the original coil winder it had made when the British firm started fifty years ago – ATC stands for Acoustic Transducer Company, after all. DRIVE TIMEĪTC has another significant differentiator to many similarly-sized loudspeaker manufacturers up its sleeve, in that it makes all its own drivers. The result of this method should be more accurate handling of the crossover points and improved control, thanks to the direct connection between the power amplifier and the drive unit. ![]() The active crossovers are fourth-order Linkwitz-Riley designs with additional all-pass filters at the two crossover points, connected directly to the drive units at line level. A pair of MOSFET transistors per channel add up to four identical output stages, fed by three separate secondary power supplies to scale the power according to the frequency band and driver demands. This configuration consists of a 150W module for the bass driver, a 60W unit that drives the midrange, and a 32W amp for the tweeter – all designed and built in-house. However, with speakers like ATC's SCM40A, this time-consuming and oft-frustrating step is rendered redundant – as its 36kg cabinet comes fitted with a dedicated 242W Class AB triamp arrangement, plus an active crossover. ![]() This quest for synergy then extends to cables, isolation, coupling and decoupling experiments and so on, too… Those of us with a love of hi-fi separates tend to spend considerable time and money searching for the ideal match between loudspeakers and amplifiers. If you think about it, active loudspeakers should be more prevalent. ATC SCM40A Active Floorstanding Loudspeakers
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